When New York City subway trains reach the end of their working life, they are stripped of their electrics and furnishings, stacked on a boat, and dropped into the Atlantic Ocean. But they do not fall into the same destructive, polluting category as most trash dumped at sea. Instead they serve as artificial reef habitats, providing a home for many kinds of sea life along the Eastern seaboard.

Photographer Stephen Mallon watched the 'dumping' happen on six occasions between 2008 and 2010, and the result is this beautiful series of photographs, titled Next Stop Atlantic.